you're not going to find much outside of silver lake, and the mounds on the east side of the state. i went on a few trail rides this winter, at the allegan state game area near allegan, and also at the yankee springs recreational area near gun lake... but both were just tame trail rides. everything that's half a challenge in this state is now closed.

there is a private park in hart, right near the dunes, that the guys hold a few events here and there. the owner is a regular poster on greatlakes4x4.com and silverlakeforum.com, goes by "FullSize4Life". nice guy, i met him at the dunes.